I am not with the majority who think Android does a great job at managing processes, I know lots of people say it, but I disagree.
If Android was so great at managing processes, it wouldn't start processes that we rarely use, but it does. Someone tried to tell me that's just how Unix behaves, I couldn't help but laugh, then proved that it wasn't true.
I have gotten into the habit of force closing apps that I don't use often because I've noticed that when you force close a user app, that app will never start again unless you start it yourself or another app calls it or something.
For instance, I will force close all live wallpapers, seesmic, music players, etc. Those apps never run again until I start them.
I don't see a problem with killing processes, though I do see a problem with killing tasks automatically, unless you know those are tasks that will not come back.
For instance, google search will keep coming back, as well as Snote, contacts, nfc, allshare, etc.
Therefore it doesn't make since to have an auto task killer kill those.